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    <title>Document</title>
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<style>
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        position: absolute;
        width: 100px;
        height: 100px;
        background-color: pink;
    }
</style>

<body>
    <div class=""></div>
    <script>
        // 高阶函数-函数可以作为参数传递
        // function fn(a, b, callback) {
        //     console.log(a + b);
        //     callback && callback();
        // }
        // fn(1, 2, function() {
        //     console.log('回调');
        // });

        // $("div").animate({
        //     left: 500
        // }, function() {
        //     $("div").css("backgroundColor", "purple")
        // })
    </script>
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